:root {
  /* Màu chủ đạo (hồng). Tên biến giữ "--blue" để không phải sửa toàn bộ CSS */
  --blue: #db2777;
  --blue-dark: #be185d;
  --blue-soft: #fdf2f8;
  /* Xanh giữ riêng cho giới tính Nam và mức "Khá" */
  --male: #1e4fa8;
  --male-soft: #eaf1fb;
  --bg: #fbf5f8;
  --card: #ffffff;
  --text: #2a1f27;
  --muted: #7a6b74;
  --line: #f0e1e8;
  --green: #15803d;
  --green-soft: #dcfce7;
  --amber: #b45309;
  --amber-soft: #fef3c7;
  --red: #dc2626;
  --red-soft: #fee2e2;
  --pink: #db2777;
  --radius: 10px;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: 'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
}
.hidden { display: none !important; }
.muted { color: var(--muted); }
.error { color: var(--red); margin-top: 8px; min-height: 18px; }
h1, h2, h3 { margin: 0; }

/* ---------- Buttons & inputs ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid var(--blue); background: #fff; color: var(--blue);
  padding: 8px 14px; border-radius: 6px; font: inherit; font-weight: 600; font-size: 13px;
  cursor: pointer; white-space: nowrap; transition: background .15s, box-shadow .15s;
}
.btn:hover { background: var(--blue-soft); }
.btn.primary { background: var(--blue); color: #fff; }
.btn.primary:hover { background: var(--blue-dark); }
.btn.danger { border-color: var(--red); color: var(--red); }
.btn.danger:hover { background: var(--red-soft); }
.btn.danger.solid { background: var(--red); color: #fff; }
.btn.green { border-color: var(--green); color: var(--green); }
.btn.green:hover { background: var(--green-soft); }
.btn.light { background: #fff; border-color: #fff; color: var(--blue); }
.btn.sm { padding: 5px 10px; font-size: 12px; }
.btn.xs { padding: 3px 8px; font-size: 12px; font-weight: 500; }
.btn.block { width: 100%; justify-content: center; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
input, select, textarea {
  font: inherit; color: inherit; border: 1px solid #cfd7e3; border-radius: 6px;
  padding: 8px 10px; background: #fff; outline: none;
}
input:focus, select:focus, textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(219, 39, 119, .14); }
label { display: flex; flex-direction: column; gap: 4px; font-weight: 500; font-size: 13px; }
.chip {
  display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 600;
  background: var(--blue-soft); color: var(--blue);
}
.badge { display: inline-block; padding: 3px 10px; border-radius: 6px; font-size: 12px; font-weight: 600; background: #eef1f6; }
.rate-Tốt { background: var(--green-soft); color: var(--green); }
.rate-Khá { background: var(--male-soft); color: var(--male); }
.rate-Đạt { background: var(--amber-soft); color: var(--amber); }
.rate-Chưa { background: var(--red-soft); color: var(--red); }

/* ---------- Login ---------- */
.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; background: linear-gradient(135deg, #be185d, #db2777 60%, #f472b6); }
.login-card { width: 100%; max-width: 380px; background: #fff; border-radius: 14px; padding: 32px 28px; display: flex; flex-direction: column; gap: 14px; box-shadow: 0 20px 50px rgba(0,0,0,.25); }
.login-card h1 { font-size: 20px; text-align: center; color: var(--blue); }
.login-card p { text-align: center; margin: -6px 0 4px; }
.login-logo { font-size: 42px; text-align: center; }

/* ---------- Header ---------- */
.topbar {
  display: flex; align-items: center; gap: 20px; padding: 12px 20px;
  background: linear-gradient(90deg, #be185d, #ec4899); color: #fff;
}
.brand h1 { font-size: 18px; letter-spacing: .3px; }
.brand-sub { display: flex; gap: 10px; align-items: center; margin-top: 4px; font-size: 12px; opacity: .95; }
.brand-sub .chip { background: rgba(255,255,255,.2); color: #fff; }
.global-search { position: relative; flex: 1; max-width: 460px; margin-left: auto; }
.global-search input { width: 100%; border: none; }
.search-results {
  position: absolute; top: calc(100% + 6px); left: 0; right: 0; z-index: 50; max-height: 420px; overflow: auto;
  background: #fff; color: var(--text); border-radius: 8px; box-shadow: 0 12px 30px rgba(0,0,0,.18);
}
.search-item { padding: 10px 14px; border-bottom: 1px solid var(--line); cursor: pointer; }
.search-item:hover { background: var(--blue-soft); }
.search-item b { display: block; }
.search-item small { color: var(--muted); }
.user { display: flex; align-items: center; gap: 8px; }
.user-name { font-weight: 700; margin-right: 6px; text-align: right; }

/* ---------- Tabs ---------- */
.tabs { display: flex; gap: 4px; background: #fff; border-bottom: 1px solid var(--line); padding: 0 16px; overflow-x: auto; }
.tabs button {
  border: none; background: none; padding: 14px 16px; font: inherit; font-weight: 600; color: var(--muted);
  cursor: pointer; border-bottom: 3px solid transparent; white-space: nowrap;
}
.tabs button.active { color: var(--blue); border-bottom-color: var(--blue); background: var(--blue-soft); }
.main { max-width: 1500px; margin: 0 auto; padding: 18px 16px 60px; }

/* ---------- Cards / toolbar ---------- */
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; margin-bottom: 14px; }
.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.toolbar .title { font-size: 17px; font-weight: 700; margin-right: 6px; }
.toolbar .spacer { flex: 1; }
.toolbar + .toolbar { margin-top: 12px; }
.filters { display: flex; flex-wrap: wrap; gap: 10px; }
.filters input[type=search] { flex: 1; min-width: 220px; }

/* ---------- Tables ---------- */
.table-wrap { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: auto; }
table { width: 100%; border-collapse: collapse; }
th { text-align: left; padding: 12px 10px; font-weight: 700; font-size: 13px; color: #5b3a4c; background: #fdf4f8; border-bottom: 2px solid var(--line); white-space: nowrap; position: sticky; top: 0; z-index: 1; }
td { padding: 10px; border-bottom: 1px solid var(--line); vertical-align: middle; }
tr:hover td { background: #fff8fb; }
tr.flash td { animation: flash 2s ease; }
@keyframes flash { 0%, 60% { background: #fff3c4; } 100% { background: transparent; } }
td.c, th.c { text-align: center; }
td.name { font-weight: 600; white-space: nowrap; }
.g-Nam { color: var(--male); font-weight: 600; }
.g-Nữ { color: var(--pink); font-weight: 600; }
.empty { padding: 40px; text-align: center; color: var(--muted); }
.actions { display: flex; flex-wrap: wrap; gap: 4px; justify-content: center; }

/* ---------- Sổ điểm ---------- */
.score { width: 56px; text-align: center; padding: 6px 4px; }
.score.invalid { border-color: var(--red); background: var(--red-soft); }
.score.saved { border-color: var(--green); }
.avg { font-weight: 700; text-align: center; min-width: 56px; }
.comment { width: 100%; min-width: 280px; min-height: 48px; resize: vertical; font-size: 13px; }

/* ---------- Danh sách lớp ---------- */
.layout-2 { display: grid; grid-template-columns: 280px 1fr; gap: 14px; align-items: start; }
.class-list { display: flex; flex-direction: column; gap: 6px; max-height: calc(100vh - 220px); overflow: auto; }
.class-item { display: flex; align-items: center; gap: 8px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; cursor: pointer; }
.class-item:hover { border-color: var(--blue); }
.class-item.active { background: var(--blue-soft); border-color: var(--blue); }
.class-item .n { font-weight: 700; font-size: 15px; }
.class-item small { color: var(--muted); display: block; }
.class-item .grow { flex: 1; }

/* ---------- Nề nếp ---------- */
.team-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; margin-bottom: 14px; }
.team-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.team-card .head { display: flex; justify-content: space-between; align-items: center; font-weight: 700; color: var(--blue); }
.team-card .big { font-size: 26px; font-weight: 800; margin: 8px 0 2px; }
.team-card .big small { font-size: 12px; font-weight: 500; color: var(--muted); }
.team-card .foot { display: flex; justify-content: space-between; align-items: center; color: var(--muted); font-size: 12px; margin-top: 6px; }
.team-card.top { border-color: #f59e0b; box-shadow: 0 0 0 2px #fde68a inset; }
.pts-neg { color: var(--red); font-weight: 700; }
.pts-pos { color: var(--green); font-weight: 700; }
.rule-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 8px; }
.rule-opt { display: flex; flex-direction: row; align-items: center; gap: 8px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; cursor: pointer; font-weight: 500; }
.rule-opt:hover { border-color: var(--blue); }
.rule-opt input { margin: 0; }
.week-label { font-weight: 600; color: var(--blue); align-self: center; }

/* ---------- Xếp tổ (kéo thả) ---------- */
.board { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 12px; align-items: start; }
.team-col { background: #fff; border: 2px solid var(--line); border-radius: var(--radius); display: flex; flex-direction: column; min-height: 200px; transition: border-color .15s, background .15s; }
.team-col.unassigned { background: #fffaf3; border-style: dashed; border-color: #f3d9b1; }
.team-col.over { border-color: var(--blue); background: var(--blue-soft); }
.team-col.target { cursor: pointer; border-color: var(--blue); border-style: dashed; }
.team-col-head { display: flex; align-items: center; gap: 8px; padding: 10px 12px; border-bottom: 1px solid var(--line); position: sticky; top: 0; background: inherit; border-radius: var(--radius) var(--radius) 0 0; }
.team-col-head b { color: var(--blue); font-size: 15px; }
.team-col.unassigned .team-col-head b { color: var(--amber); }
.team-col-head small { margin-left: auto; color: var(--muted); font-size: 12px; }
.team-col-body { padding: 8px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.stu-card {
  display: flex; align-items: center; gap: 8px; padding: 8px 10px; border: 1px solid var(--line); border-left: 4px solid var(--male);
  border-radius: 6px; background: #fff; cursor: grab; user-select: none; font-weight: 500;
}
.stu-card.f { border-left-color: var(--pink); }
.stu-card small { margin-left: auto; color: var(--muted); font-size: 11px; font-weight: 400; }
.stu-card:hover { box-shadow: 0 2px 8px rgba(0,0,0,.08); }
.stu-card.dragging { opacity: .4; }
.stu-card.picked { outline: 2px solid var(--blue); background: var(--blue-soft); }
.stu-card.dim { opacity: .3; }
.stu-card.hit { outline: 2px solid #f59e0b; }
.drop-hint { color: var(--muted); text-align: center; padding: 24px 8px; font-size: 13px; border: 1px dashed var(--line); border-radius: 6px; }

/* ---------- Chart ---------- */
.chart { width: 100%; overflow-x: auto; }
.legend { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 8px; font-size: 12px; }
.legend span::before { content: ''; display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 5px; background: var(--c); }

/* ---------- TKB ---------- */
.tkb-paper { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 24px; max-width: 1200px; margin: 0 auto; }
.tkb-head { text-align: center; padding-bottom: 12px; margin-bottom: 16px; border-bottom: 2px solid var(--blue); }
.tkb-head h2 { color: var(--blue); font-size: 22px; }
.tkb-head div { color: var(--muted); margin-top: 4px; font-size: 13px; }
.tkb { width: 100%; border-collapse: separate; border-spacing: 6px; }
.tkb th { background: var(--blue); color: #fff; text-align: center; padding: 12px; border: none; border-radius: 6px; position: static; }
.tkb td { border: none; padding: 0; }
.tkb .session td { padding: 8px; text-align: center; font-weight: 700; border-radius: 6px; }
.tkb .session.sang td { background: #fff8e1; color: #b45309; border-left: 4px solid #f59e0b; }
.tkb .session.chieu td { background: #fdeef5; color: var(--blue); border-left: 4px solid var(--blue); }
.tkb .period { text-align: center; width: 110px; }
.tkb .period b { display: inline-block; padding: 4px 12px; border: 1px solid var(--line); border-radius: 6px; background: #f8fafc; }
.tkb .period small { display: block; color: var(--muted); font-size: 11px; margin-top: 3px; }
.tkb-cell {
  height: 54px; border: 1px dashed #cfd7e3; border-radius: 8px; display: flex; flex-direction: column; align-items: center; justify-content: center;
  cursor: pointer; color: #9aa5b8; background: #fbfcfe; padding: 4px; text-align: center;
}
.tkb-cell:hover { border-color: var(--blue); background: var(--blue-soft); }
.tkb-cell.filled { border-style: solid; border-color: #f9c4dc; background: #fff5fa; color: var(--text); }
.tkb-cell .s { font-weight: 700; color: var(--blue); }
.tkb-cell .t { font-size: 11px; color: var(--muted); }
.seg { display: inline-flex; background: #eef1f6; border-radius: 8px; padding: 3px; }
.seg label { flex-direction: row; align-items: center; gap: 6px; padding: 4px 10px; }

/* ---------- Cài đặt ---------- */
.settings-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(360px, 1fr)); gap: 14px; align-items: start; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form-grid .full { grid-column: 1 / -1; }
.list-row { display: flex; align-items: center; gap: 8px; padding: 8px 0; border-bottom: 1px solid var(--line); }
.list-row .grow { flex: 1; }

/* ---------- Modal ---------- */
.modal-bg { position: fixed; inset: 0; background: rgba(15, 23, 42, .45); display: grid; place-items: center; padding: 16px; z-index: 100; }
.modal { background: #fff; border-radius: 12px; width: 100%; max-width: 620px; max-height: calc(100vh - 32px); display: flex; flex-direction: column; box-shadow: 0 25px 60px rgba(0,0,0,.3); }
.modal.wide { max-width: 980px; }
.modal-head { display: flex; align-items: center; justify-content: space-between; padding: 14px 18px; border-bottom: 1px solid var(--line); }
.modal-head h3 { font-size: 16px; color: var(--blue); }
.modal-head button { border: none; background: none; font-size: 22px; cursor: pointer; color: var(--muted); }
.modal-body { padding: 16px 18px; overflow: auto; }
.modal-foot { display: flex; justify-content: flex-end; gap: 8px; padding: 12px 18px; border-top: 1px solid var(--line); }
.steps { padding-left: 20px; line-height: 1.7; }
.steps code, .code { background: #f1f5f9; padding: 2px 6px; border-radius: 4px; font-family: Consolas, monospace; font-size: 12px; }
.result-box { background: #f8fafc; border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; max-height: 260px; overflow: auto; font-size: 13px; }

/* ---------- Toast ---------- */
.toast-root { position: fixed; right: 16px; bottom: 16px; display: flex; flex-direction: column; gap: 8px; z-index: 200; }
.toast { background: #1f2a3d; color: #fff; padding: 10px 16px; border-radius: 8px; box-shadow: 0 8px 24px rgba(0,0,0,.2); max-width: 380px; animation: slide .2s ease; }
.toast.ok { background: var(--green); }
.toast.err { background: var(--red); }
@keyframes slide { from { transform: translateY(10px); opacity: 0; } }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .topbar { flex-wrap: wrap; }
  .global-search { order: 3; max-width: none; flex-basis: 100%; }
  .layout-2 { grid-template-columns: 1fr; }
  .class-list { max-height: 220px; }
  .form-grid { grid-template-columns: 1fr; }
}
@media print {
  .topbar, .tabs, .no-print { display: none !important; }
  body { background: #fff; }
}